Rubber member molding method, rubber member molding device, molding drum, and computer-readable recording medium

Abstract

A rubber member molding method is a rubber member molding method of molding a rubber member in a band shape by adhering rubber discharged from a die to a molding surface while relatively moving the die and the molding surface in a direction along the molding surface, wherein, before molding is started, a position at which one of the die and the molding surface is moved in a direction in which the other is approached to abut against the other is set as an abutment position, and a position at which one is moved from the abutment position in a direction in which the other is separated by an amount corresponding to a thickness of the rubber member desired at the start of molding is set as a molding start position.

Description

TECHNICAL FIELD

[0001] The present application relates to a rubber member molding method, a rubber member molding device, a molding drum, and a program. BACKGROUND

[0002] A method is known in which a rubber discharged from a die of an extruder is attached to a molding surface while moving the molding surface, thereby molding a rubber member in a band shape (for example, Patent Literature 1 below). In this method, the rubber discharged from the die passes through a gap between the die and the molding surface, whereby a rubber member having a desired thickness is molded. Therefore, the gap between the die and the molding surface greatly affects the attachment accuracy and the size of the rubber member.

[0003] Conventionally, the gap between the die and the molding surface is set by hand. Specifically, the die is gradually brought closer to the molding surface little by little, and the gap is actually measured using a feeler gauge or the like to determine the position of the die. However, in the case where the gap is actually measured using a feeler gauge or the like, a deviation due to individual differences occurs, and it is difficult to set the gap between the die and the molding surface with high accuracy.

[0004] PRIOR ART DOCUMENTS

[0005] PATENT LITERATURE

[0006] Patent Literature 1: Japanese Patent Application Publication No. 2020-185760 SUMMARY

[0007] PROBLEMS TO BE SOLVED BY THE INVENTION

[0008] An object of the present application is to provide a rubber member molding method, a rubber member molding device, a molding drum, and a program capable of setting a gap between a die and a molding surface with high accuracy.

[0009] MEANS FOR SOLVING THE PROBLEMS

[0010] The rubber member molding method of the present application is a rubber member molding method of molding a rubber member in a band shape by attaching a rubber discharged from a die to a molding surface while relatively moving the die and the molding surface in a direction along the molding surface, in which

[0011] Before molding is started, a position at which one of the die and the molding surface is moved in a direction in which the one approaches the other so as to abut against the other is set as an abutment position, and a position at which the one is moved from the abutment position in a direction in which the one moves away from the other by an amount corresponding to a thickness of a rubber member desired at the start of molding is set as a molding start position. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1AFig. 1 is a front view schematically showing a rubber member molding apparatus of the present embodiment.

[0013] Figure 1B Fig. 2 is a plan view schematically showing the rubber member molding apparatus of the present embodiment.

[0014] Figure 2 Fig. 3 is a block diagram showing the function of a control system of the rubber member molding apparatus.

[0015] Figure 3 Fig. 4 is a flowchart showing an example of a rubber member molding method.

[0016] Figure 4 Fig. 5 is a diagram showing the positional relationship of an extruder, a molding drum, and a sensor.

[0017] Figure 5 Fig. 6 is a diagram showing the positional relationship of an extruder, a molding drum, and a sensor.

[0018] Figure 6 Fig. 7 is a diagram showing the positional relationship of an extruder, a molding drum, and a sensor.

[0019] Figure 7 Fig. 8 is a diagram showing the positional relationship of an extruder, a molding drum, and a sensor.

[0020] Figure 8 Fig. 9 is a diagram showing the positional relationship of an extruder, a molding drum, and a sensor.

[0021] Figure 9 Fig. 10 is a diagram showing the positional relationship of an extruder, a molding drum, and a sensor. DETAILED DESCRIPTION

[0022] Hereinafter, the present embodiment will be described with reference to Figures 1A-9 One embodiment of a rubber member molding method and a rubber member molding apparatus will be described. In each of the drawings, the dimensional ratio of the drawing is not necessarily the same as the actual dimensional ratio, and the dimensional ratio between the drawings is not necessarily the same.

[0023] <Configuration of Rubber Member Molding Apparatus>

[0024] Figure 1A and Figure 1B Fig. 1 is a front view schematically showing a rubber member molding apparatus of the present embodiment. Figure 1A is a front view, Figure 1B is a plan view. Figure 2 Fig. 3 is a block diagram showing the function of a control system of the rubber member molding apparatus.

[0025] As Figure 1A and Figure 1BAs shown, the rubber member molding device 1 is provided with: an extruder 2 that kneads rubber and extrudes it toward a die 21; a molding drum 3; a forward-backward driving device 4 that drives the extruder 2 forward and backward; a servo motor 5 that rotates and drives the molding drum 3; a sensor 6 that measures displacement of the molding drum 3; and a control device 7 (not shown in Figure 1A and Figure 1B ).

[0026] In the following description, as shown in Figure 1A and Figure 1B , the direction in which the extruder 2 extrudes rubber is set as the X direction, the direction of the cylindrical axis of the cylindrical molding drum 3 is set as the Y direction, and the direction orthogonal to the X direction and the Y direction is set as the Z direction. Also, in expressing directions, in cases of distinguishing the positive and negative directions, the signs of the directions are written with the positive and negative signs, as in "+X direction" and "-X direction", and in cases of expressing directions without distinguishing the positive and negative directions, only the directions are written as "X direction".

[0027] The extruder 2 has: a cylindrical barrel 2a; a hopper 2b connected to a supply port of the barrel 2a; a screw (not shown) that kneads rubber inside the barrel 2a and feeds it to the front end (+X direction) side; and a screw motor 2c that rotationally drives the screw. The operation of the screw motor 2c is controlled by the control device 7.

[0028] On the front end side of the extruder 2, a gear pump 20 that feeds rubber supplied from the extruder 2 to the die 21 is connected. The gear pump 20 feeds a constant amount of rubber toward the die 21 connected to the front end side thereof. The gear pump 20 has a pair of gears 20a rotationally driven by a gear motor (not shown). The operation of the gear motor is controlled by the control device 7. Rubber is extruded in a given discharge amount via the gear pump 20 and the die 21.

[0029] The extruder 2 is configured to be able to move forward and backward in the extrusion direction (X direction) by the forward-backward driving device 4. The extruder 2 approaches the molding drum 3 by advancing and moves away from the molding drum 3 by retreating. The gear pump 20 and the die 21 connected to the extruder 2 move forward and backward integrally with the extruder 2. The forward-backward driving device 4 corresponds to the moving mechanism of the present application. The operation of the forward-backward driving device 4 is controlled by the control device 7.

[0030] The molding drum 3 has a plurality of segment molds 30 arranged in the circumferential direction to form a cylindrical molding surface 3s. In the present embodiment, an example is shown in which the molding drum 3 has twelve segment molds 30. Also, the number of segment molds 30 is not limited to this, and may, for example, be six or eight. Each segment mold 30 is formed in a plate shape that is curved in a circular arc shape as viewed from the direction of the cylindrical axis of the molding drum 3.

[0031] Each of the assembly dies 30 is displaced in the radial direction by a cylinder device not shown. Thus, the molding drum 3 is configured to be expandable and contractable in accordance with the displacement of the assembly dies 30. Such a molding drum 3 having an assembly die configuration is known in the art, for example, disclosed in Japanese Patent Application Publication No. 2004-358680 and the like.

[0032] The molding drum 3 is configured to be rotatable about the cylindrical shaft 3a by the servo motor 5. The molding drum 3 is cantilevered to the servo motor 5. However, in order not to cause unnecessary displacement of the molding drum 3 in molding, the cylindrical shaft 3a of the molding drum 3 on the opposite side to the servo motor 5 is fixed by a tailstock not shown at the time of molding. The operation of the servo motor 5 is controlled by the control device 7. On the molding surface 3s of the molding drum 3, the rubber discharged from the die 21 is wound. The molding drum 3 is configured to be swingable (reciprocally movable) in the cylindrical shaft direction (Y direction) together with the servo motor 5 by a swing drive device 31 (refer to Figure 1A ). The operation of the swing drive device 31 is controlled by the control device 7. By relatively swinging the molding drum 3 while rotating it with respect to the extruder 2, it is possible to wind the rubber in a helical shape in the circumferential direction, and to mold a ring-shaped rubber member having a desired cross-sectional shape. Alternatively, it is also possible to mold a ring-shaped rubber member by winding the rubber only once on the rotating molding drum 3 without swinging the molding drum 3 with respect to the extruder 2.

[0033] The sensor 6 measures the displacement of the molding drum 3. As described above, the molding drum 3 is cantilevered to the servo motor 5, and thus a slight displacement can occur due to an external force. The sensor 6 is capable of measuring the slight displacement of the molding drum 3. The type of the sensor 6 is not particularly limited, and can be a laser displacement meter, a profilometer, but is preferably a contact sensor.

[0034] The sensor 6 is disposed on the opposite side to the extruder 2 with the molding drum 3 interposed therebetween. From the cylindrical shaft direction of the molding drum 3, the sensor 6, the cylindrical shaft 3a of the molding drum 3, and the die 21 are disposed on a straight line. In other words, when viewed from the cylindrical shaft direction of the molding drum 3, the sensor 6 is disposed on the extension line of the direction in which the die 21 approaches the molding surface 3s of the molding drum 3 (specifically, on the straight line passing through the die 21 and the cylindrical shaft 3a). Furthermore, as shown in Figure 1B , the sensor 6 is disposed opposite the -Y direction side of the molding drum 3. According to this configuration, the molding drum 3 is cantilevered on the +Y direction side, and the displacement on the -Y direction side is large, and thus it is easy to measure the slight displacement of the molding drum 3 with the sensor 6.

[0035] The sensor 6 is configured to be movable forward and backward in the extruding direction (X direction) of the extruder 2 by a sensor drive device 60 (refer to Figure 2 ). The sensor 6 approaches the molding drum 3 by advancing, and moves away from the molding drum 3 by retreating. The operation of the sensor drive device 60 is controlled by the control device 7.

[0036] The control device 7 controls the operation of the front and rear drive devices 4, the servo motor 5, the sensor drive device 60, and the like, in accordance with the production instruction transmitted from the production management section 8. Figure 2 Further, although not shown in the Figure 2 , the control device 7 also controls the operation of the screw motor 2c of the extruder 2, and the gear motor of the gear pump 20. The control device 7 has a data acquisition section 71, a storage section 72, a molding position calculation section 73, and an instruction section 74.

[0037] The data acquisition section 71 receives the production instruction from the production management section 8. Further, the data acquisition section 71 acquires the measurement data of the drum encoder 3e, the extruder encoder 2e, and the sensor 6. The drum encoder 3e measures the displacement of the molding drum 3 caused by the servo motor 5, and outputs the position information as an electric signal. The extruder encoder 2e measures the displacement of the extruder 2 caused by the front and rear drive devices 4, and outputs the position information as an electric signal.

[0038] The storage section 72 stores the drum position (described later), the extruder standby position (described later), the extruder advancing position (described later), and the member shape. The member shape is data related to the shape of the rubber member to be molded.

[0039] The molding position calculation section 73 includes a drum position calculation section 73a, an extruder abutting position calculation section 73b, and an extruder molding start position calculation section 73c. The drum position calculation section 73a calculates the position of the molding drum 3. The position of the molding drum 3 includes the position in the cylinder axis direction (Y direction) of the molding drum 3, and the position in the rotational direction (circumferential direction) of the molding drum 3. The extruder abutting position calculation section 73b calculates the position of the extruder 2 (abutting position) when the extruder 2 abuts against the molding drum 3, specifically, the die 21 and the molding surface 3s. The extruder molding start position calculation section 73c calculates the position of the extruder 2 (molding start position) when the discharge of the rubber from the die 21 starts.

[0040] The instruction section 74 transmits an instruction signal to the servo motor 5, the front and rear drive devices 4, and the sensor drive device 60, based on the data calculated by the molding position calculation section 73 and the data stored in the storage section 72.

[0041] < Rubber member molding method >

[0042] Next, referring to Figures 3-9 the rubber member molding method will be described. Figure 3 is a flowchart showing an example of the rubber member molding method. Figures 4-9 is a diagram showing the positional relationship of the extruder 2, the molding drum 3, and the sensor 6 in the rubber member molding method.

[0043] Figure 4 The positional relationship of the extruder 2, forming drum 3, and sensor 6 before forming begins is shown. The extruder 2 and die 21 are in standby position P1. This standby position P1 is pre-stored in the storage unit 72 as position information from the extruder encoder 2e. In addition, the sensor 6 is also in standby position Q1, away from the forming drum 3.

[0044] The forming drum 3 moves along the cylindrical axis (Y direction) via the oscillating drive device 31 and stops at a stop position R1 opposite to the die 21 of the extruder 2. This stop position R1 of the forming drum 3 is calculated by the drum position calculation unit 73a. A signal indicating that the forming drum 3 has stopped is sent to the control device 7.

[0045] First, in step S100, sensor 6 moves forward from standby position Q1 via sensor drive device 60. Sensor 6 continues to move forward until its front end contacts the molding surface 3s of molding drum 3.

[0046] Next, in step S101, it is determined whether sensor 6 has detected displacement. Sensor 6 detects displacement when it comes into contact with the molding surface 3s. If sensor 6 does not detect displacement (No in step S101), that is, if sensor 6 has not yet come into contact with the molding surface 3s, sensor 6 returns to step S101 and continues moving forward.

[0047] On the other hand, if sensor 6 detects displacement ("Yes" in step S101), that is, if... Figure 5 When the front end of the sensor 6 contacts the molding surface for 3 seconds, the sensor 6 stops in step S102. The storage unit 72 stores the stopping position Q2 of the sensor 6. Furthermore, the detection value of the sensor 6 at the stopping position Q2 is set as the zero point of the sensor 6.

[0048] Next, in step S103, the extruder 2 advances from the standby position P1 via the front and rear drive device 4. The extruder 2 continues to advance until the die 21 abuts against the forming surface 3s. Whether the die 21 abuts against the forming surface 3s is determined by the displacement of the forming drum 3 from the stop position R1. Specifically, as the extruder 2 advances, the die 21... Figure 6 After the contact start position P2 begins to contact the molding surface 3s, and the contact state remains unchanged, when the die 21 pushes the molding drum 3, causing the molding drum 3 to shift slightly from the stop position R1, it is determined that the die 21 is in contact with the molding surface 3s. In this embodiment, it is determined that the die 21 is in contact with the molding surface 3s when the molding drum 3 has shifted 0.01mm from the stop position R1.

[0049] In step S104, it is determined whether the displacement measured by sensor 6 is less than a predetermined value. The predetermined value is preferably 0.10 mm or less, more preferably 0.01 mm or less. In this embodiment, the predetermined value is set to 0.01 mm as described above. If the displacement measured by sensor 6 is less than the predetermined value ("Yes" in step S104), the extruder 2 returns to step S103 and continues moving forward.

[0050] On the other hand, if the displacement measured by sensor 6 reaches a predetermined value (No in step S104), in step S105, extruder 2 stops. The positions of extruder 2 and die 21 at this time are set as... Figure 7 The contact position P3 is shown. Additionally, as the extruder 2 advances, the forming drum 3 also moves slightly from the stop position R1 to the contact position R2. If it is determined that the die 21 is in contact with the forming surface 3s, the forward position L1 of the extruder 2 is stored in the storage unit 72. This forward position L1 is the distance the extruder 2 travels from the standby position P1 to the contact position P3. When the forward position L1 is stored, the sensor 6 retracts from the stop position Q2 and returns to the standby position Q1. The contact position P3 of the extruder 2 is calculated by the extruder contact position calculation unit 73b based on the standby position P1 and the forward position L1. Furthermore, after step S106 described later, the sensor 6 may remain stationary at the stop position Q2.

[0051] Next, in step S106, the forming start position P4 of the extruder 2 is set. The forming start position P4 is the position where the rubber discharged from the die 21 begins to adhere to the forming surface 3s. Figure 8 As shown, the molding start position P4 is a position that is backed by the contact position P3 by an amount corresponding to the desired thickness t of the rubber component at the start of molding. The data for the desired rubber component thickness t is stored in the storage unit 72 as one of the component shapes. The thickness t of the rubber component is, for example, 0.10 to 0.50 mm. The molding start position P4 is calculated by the extruder molding start position calculation unit 73c based on the contact position P3 and the thickness t.

[0052] After that, as Figure 9 As shown, the extruder 2 begins discharging rubber 9 at the molding start position P4, and the molding drum 3 begins rotating approximately simultaneously. This initiates the adhesion of the rubber 9 discharged from the die 21 to the molding surface 3s. The rubber 9 discharged from the die 21 passes through the gap between the die 21 and the molding surface 3s, thereby forming a rubber component with the desired thickness t.

[0053] As described above, the rubber member molding method according to the present embodiment is a rubber member molding method of molding a rubber member in a band shape by adhering the rubber 9 discharged from the die 21 to the molding surface 3s while relatively moving the die 21 and the molding surface 3s in a direction along the molding surface 3s,

[0054] Before the molding is started, a position at which the die 21 is moved in a direction approaching the molding surface 3s to abut against the molding surface 3s is set as the abutment position P3, and a position at which the die 21 is moved from the abutment position P3 in a direction away from the molding surface 3s by an amount corresponding to the thickness t of the rubber member desired at the start of the molding is set as the molding start position P4.

[0055] According to this structure, the gap between the die 21 and the molding surface 3s can be set with high precision so as to become the thickness t of the desired rubber member, starting from the abutment position P3 at which the die 21 actually abuts against the molding surface 3s, and moving the die 21 away from the molding surface 3s by an amount corresponding to the thickness t of the rubber member desired at the start of the molding from this starting point.

[0056] Further, in the rubber member molding method according to the present embodiment, the abutment position P3 is a position at which the molding surface 3s is slightly displaced while the die 21 and the molding surface 3s are kept in contact after the start of contact.

[0057] According to this structure, the position at which the die 21 actually abuts against the molding surface 3s can be accurately set as the abutment position P3.

[0058] Further, in the rubber member molding method according to the present embodiment, the measurement of the slight displacement is performed by a contact sensor that measures the displacement of the molding surface 3s.

[0059] According to this structure, the slight displacement of the molding surface 3s can be reliably measured.

[0060] Further, as described above, the rubber member molding apparatus according to the present embodiment is a rubber member molding apparatus 1 of molding a rubber member in a band shape, which includes:

[0061] the die 21 that discharges the rubber 9; the molding surface 3s that is adhered to the rubber 9 discharged from the die 21 while relatively moving with respect to the die 21; the moving mechanism 4 that moves the die 21 to approach or depart from the molding surface 3s; the sensor 6 that detects the approach and abutment of the die 21 and the molding surface 3s; and the control device 7 that controls the moving mechanism 4,

[0062] The control device 7 approaches the die 21 toward the molding surface 3s before molding starts, and when the abutment detection signal is received from the sensor 6, the die 21 is separated from the molding surface 3s by an amount corresponding to the thickness t of the rubber member desired at the start of molding from the abutment position P3 at which the die 21 abuts against the molding surface 3s.

[0063] According to this structure, the die 21 is separated from the molding surface 3s by an amount corresponding to the thickness t of the rubber member desired at the start of molding from the abutment position P3 at which the die 21 actually abuts against the molding surface 3s, and thus the gap between the die 21 and the molding surface 3s can be set with high precision so as to become the thickness t of the rubber member desired.

[0064] Further, in the rubber member molding device 1 according to the present embodiment, the sensor 6 is configured to be a contact sensor that measures the displacement of the molding surface 3s.

[0065] According to this structure, the sensor 6 can reliably measure the slight displacement of the molding surface 3s.

[0066] Further, in the rubber member molding device 1 according to the present embodiment, the sensor 6 is configured to be disposed behind the molding surface 3s when viewed from the die 21.

[0067] According to this configuration, the sensor 6 can reliably measure the slight displacement of the molding surface 3s that is displaced by the die 21.

[0068] Further, in the rubber member molding device 1 according to the present embodiment, the sensor 6 is configured to be disposed on an extension line of the direction in which the die 21 approaches the molding surface 3s.

[0069] According to this structure, since the direction of displacement of the molding drum 3 and the direction of orientation of the sensor 6 are opposite to each other, a contact sensor with high reliability can be used as the sensor 6.

[0070] Further, the molding drum 3 according to the present embodiment includes a molding surface 3s that is a cylindrical surface to which rubber 9 discharged from the die 21 is adhered, a motor 5 that rotates the molding surface 3s around a cylindrical axis, and a sensor 6 that detects the approach and abutment of the die 21 against the molding surface 3s. According to this structure, the actual abutment of the die 21 against the molding surface 3s can be detected.

[0071] Further, the program according to the present embodiment causes a computer to execute the above-described rubber member molding method. By executing these programs, the effects of the above-described method can also be obtained. In other words, it can also be said that the above-described method is used.

[0072] The above describes the embodiments of the present application based on the drawings, but it should be considered that the specific structures are not limited to these embodiments. The scope of the present application is not only shown by the above-described embodiments but also by the scope of the claims, and includes all modifications within the equivalent meaning and scope of the claims.

[0073] The configuration employed in each of the above-described embodiments can be employed in any other embodiment. The specific structures of the parts are not limited to those described above, and various modifications can be made within the scope of the gist of the present application.

[0074] For example, the order of execution of each process such as the devices, programs, and actions, processes, steps, and stages of the methods shown in the scope of the claims, the specification, and the drawings can be implemented in any order as long as the output of the preceding process is not used in the following process. With regard to the flow in the scope of the claims, the specification, and the drawings, even if the description is made using "first," "next," and the like for convenience, it does not mean that it must be executed in that order.

[0075] In the rubber member molding method according to the above-described embodiment, the position at which the die 21 is moved in the direction approaching the molding surface 3s to abut against the molding surface 3s is set as the abutment position P3 before the molding is started, and the position at which the die 21 is moved from the abutment position P3 in the direction away from the molding surface 3s by an amount corresponding to the thickness t of the rubber member desired at the start of the molding is set as the molding start position P4. However, the rubber member molding method is not limited to this structure. For example, the molding surface 3s can be made to approach or move away from the die 21. That is, it can be configured such that the position at which the molding surface 3s is moved in the direction approaching the die 21 to abut against the die 21 is set as the abutment position before the molding is started, and the position at which the molding surface 3s is moved from the abutment position in the direction away from the die 21 by an amount corresponding to the thickness t of the rubber member desired at the start of the molding is set as the molding start position. At this time, the sensor 6 measures the displacement of the die 21.

[0076] In the rubber member molding method and the rubber member molding apparatus according to the above-described embodiment, the molding drum 3 is composed of a plurality of combination dies 30 arranged in the circumferential direction, but it is not limited thereto. The molding drum 3 can be configured as a unit without being divided into combination dies.

[0077] Further, in the rubber member molding method and the rubber member molding apparatus according to the above-described embodiment, the molding surface is set as the cylindrical molding surface 3s of the molding drum 3, but it is not limited thereto. As the molding surface, it can be a disc-shaped molding surface of a rotating disc.

[0078] 1 … rubber member molding apparatus, 2 … extruder, 2e … extruder encoder, 3 … molding drum, 3e … drum encoder, 3s … molding surface, 4 … front and rear driving device (moving mechanism), 5 … servo motor, 6 … sensor, 7 … control device, 9 … rubber, 21 … die, 60 … sensor driving device, P1 … standby position of die, P2 … contact start position of die, P3 … abutment position of die, P4 … molding start position of die, Q1 … standby position of sensor, Q2 … stop position of sensor, R1 … stop position of molding drum, R2 … abutment position of molding drum, t … desired thickness of rubber member.

Claims

1. A rubber member molding method of molding a rubber member in a band shape by adhering rubber discharged from a die to a molding surface while relatively moving the die and the molding surface in a direction along the molding surface, wherein a position at which one of the die and the molding surface is moved toward the other to abut against the other before molding is started is set as an abutting position, and a position at which the one is moved from the abutting position by an amount corresponding to a thickness of a rubber member desired at the start of molding in a direction away from the other is set as a molding start position.

2. The rubber member molding method according to claim 1, wherein the abutting position is a position at which the other is slightly displaced while the one and the other are in contact after the one and the other start to contact.

3. The rubber member molding method according to claim 2, wherein the slight displacement is measured by a contact sensor that measures displacement of the other from the one.

4. A rubber member molding apparatus of molding a rubber member in a band shape, wherein the rubber member molding apparatus comprises: a die that discharges rubber; a molding surface that is adhered to rubber discharged from the die while relatively moving with respect to the die; a moving mechanism that moves one of the die and the molding surface toward or away from the other; a sensor that detects that the one approaches and abuts against the other; and a control device that controls the moving mechanism, the control device moves the one toward the other before molding is started, and when an abutment detection signal is received from the sensor, moves the one away from the other from an abutting position at which the one abuts against the other by an amount corresponding to a thickness of a rubber member desired at the start of molding.

5. The rubber member molding apparatus according to claim 4, wherein the sensor is a contact sensor that measures displacement of the other.

6. The rubber member molding apparatus according to claim 4 or 5, wherein the sensor is disposed behind the other when viewed from the one.

7. The rubber member molding apparatus according to claim 6, wherein the sensor is disposed on an extension line of a direction in which the one approaches the other.

8. A molding drum comprising: a molding surface in a cylindrical shape that is adhered to rubber discharged from a die; a motor that rotates the molding surface around a cylindrical axis; and a sensor that detects that the die approaches and abuts against the molding surface, the sensor is disposed behind the molding surface when viewed from the die.

9. A computer-readable recording medium that stores a program for causing a computer to execute the rubber member molding method according to any one of claims 1 to 3. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

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